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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 15) 404 N Wiget lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> low Analytiea 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North,Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1tler-13yan= 06blin v v Client Project ID Unocal SS#5098, toc�Cton � #` { ampled i�ec 22, 1998 <br /> 74'7 Sierra Court, Suite J Sample Matrix Water Received Dec 23, 1998 , <br /> v Dublin, CA 94568 Analysis Method EPA 5030/8015 Mod /8020 Reported Jan 13, 1999 <br /> Attention Deanna Harding First Sample # 812-2064 ,;_, S j <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX % MTBE <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D. I D I D I D I D LD <br /> dig/L 812-2064 812-2065 812-2066 812-2067 812-2068 812-2069 <br /> TB-LB MW-10 MW-11 MW-12 MW-13 MW-14 <br /> Purgeable <br /> Hydrocarbons 50 N D N D 20,000 4,900 N D N D <br /> Benzene 050 N D N D 5,600 320 N D N D <br /> Toluene 0 50 N D N D 230 N D N D N D <br /> Ethyl Benzene 0 50 N D N D 330 340 N D N D <br /> OTotal Xylenes 0 50 N D N D 1,500 38 N D N D <br /> MTBE 25 ND ND ND 170 ND ND <br /> Chromatogram Pattern -- -- Gasoline Gasoline <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 100 40 1 0 1 0 <br /> Date Analyzed 1/4/99 1/4/99 1/4/99 1/5/99 1/4/99 1/4/99 <br /> Instrument Identification HP-5 HP-5 HP-5 HP-9 HP-5 HP-5 <br /> Surrogate Recovery, % 92 95 93 93 96 107 <br /> (QC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> SEQUOIA ANALYTICAL, #1271 <br /> i VV_ "/�4 <br /> Janne Zgley <br /> Project Manager <br /> 8122064 GET <1> <br />